| 1. | Researchers have been looking for the Rainbow volcanic vent system since 1994.
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| 2. | Direct-vent systems are from 75 percent to 80 percent efficient, Hahn said.
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| 3. | With a B-vent system, most of the heat goes out the vent,
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| 4. | It's a good choice for drain and vent systems and for drain traps.
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| 5. | And that's where a direct vent system comes in ."
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| 6. | Powered direct-vent systems include an exhaust fan to aid in the expulsion of combustion gasses.
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| 7. | "' Lj�sufj�ll "'is a fissure vent system and central volcano on the Sn�fellsnes Peninsula in Iceland.
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| 8. | It is used for drain and vent systems.
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| 9. | "' Vatnafj�ll "'is a long, wide basaltic fissure vent system that is located southeast of Hekla, Iceland.
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| 10. | Vent fauna need good dispersal characteristics so as to be able to colonise newly formed vent systems.
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